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Closed Access item Heterologous expression of enterocin AS-48 in several strains of lactic acid bacteria

Authors:Fernández, Matilde
Martínez-Bueno, M.
Martín, M. Cruz
Valdivia, E.
Maqueda, M.
Keywords:Bacteriocin, Circular Antimicrobial Peptide, Enterococcus, Lactobacillus, Lactococcus
Issue Date:May-2007
Publisher:Blackwell Publishing
Citation:Journal of Applied Microbiology 102(5): 1350-1361 (2007)
Abstract:[Aims] Enterococcus faecalis produces a cationic and circular enterocin, AS-48, of 7149 Da, the genetic determinants of which are located within the pMB2 plasmid. We have compared enterocin AS-48 production by different enterococci species with that of other `safe' lactic acid bacteris (LAB) (GRAS status) and looked into the subsequent application of this enterocin in food production.
[Methods and Results] In an effort to exploit this system for the heterologous expression of enterocin AS-48, a number of vectors containing the as-48 cluster were constructed and used to transform several LAB strains (genera Enterococcus, Lactococcus and Lactobacillus).
[Conclusion] Heterologous production of enterocin AS-48 failed when bacteria other than those belonging to the genus Enterococcus were used as hosts, although expression of a partial level of resistance against AS-48 were always detected, ruling out the possibility of a lack of recognition of the enterococcal promoters.
[Significance and Impact of the Study] Our results reveal the special capacity of species from the genus Enterococcus to produce AS-48, an enterocin that requires a post-transcriptional modification to generate a circular peptide with a wide range of inhibitory activity against pathogenic and spoilage bacteria. Preliminary experiments in foodstuffs using nonvirulent enterococci with interesting functional properties reveal the possibility of a biotechnological application of these transformants.
Publisher version (URL):http://dx.doi.org/10.1111/j.1365-2672.2006.03194.x
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